uncompface(3) [debian man page]

COMPFACE(3)						     Library Functions Manual						       COMPFACE(3)

NAME

       compface, uncompface - compress and expand 48x48x1 face image files

SYNOPSIS

       compface (buf)

       uncompface (buf)

       char *buf

DESCRIPTION

       compface  is  a	function  for generating highly compressed representations of 48x48x1 face image files.  uncompface is an inverse function
       which performs an inverse transformation with no loss of data.  The algorithm used is highly tuned for its purpose and achieves better than
       a  five	to one compression ratio on average.  In both functions, input is via a NULL terminated string and a NULL terminated output string
       is written over the input string.  Buf should therefore point to a block of 2K size or more to avoid buffer overruns during output  genera-
       tion.

       The  input  format for compface (and the output format for uncompface) is 48 lines each of 3 sixteen bit hexadecimal integers, comma termi-
       nated in C initialiser style.  The output format of compface (and the input format for uncompface) is some number of lines  made  up  of  a
       space  followed by printable characters (in the range ``!'' to ``~'' inclusive).  The first line contains 72 characters and following lines
       contain 79 characters except that the last line may be short.

       This version of compface has been patched to also be able to handle normal XBM images.  uncompface will produce XBM output only if  the	-X
       switch is applied.

       The amount of compression obtained varies between face image files but the output of compface averages less than 200 characters.  The aver-
       age number of output lines is three.

DIAGNOSTICS

       The return value is normally 0.	1 will be returned if extra input has been ignored during a compress operation.  -1  is  returned  in  the
       case of an invalid input format.  -2 is returned if an internal buffer overrun occurs.

SEE ALSO

       Compface(1)

								  25 January 1990						       COMPFACE(3)

SETBUF(3)						     Library Functions Manual							 SETBUF(3)

NAME

       setbuf, setvbuf - assign buffering to a stream

SYNOPSIS

       #include <stdio.h>

       int setbuf(FILE *stream, char *buf)
       int setvbuf(FILE *stream, char *buf, int type, size_t size)

DESCRIPTION

       The three types of buffering available are unbuffered, block buffered, and line buffered.  When an output stream is unbuffered, information
       appears on the destination file or terminal as soon as written; when it is block buffered many characters are saved up  and  written  as  a
       block; when it is line buffered characters are saved up until a newline is encountered or input is read from stdin.  Fflush (see fclose(3))
       may be used to force the block out early.  Normally all files are block buffered.  A buffer is obtained from malloc(3) upon the first  getc
       or  putc(3)  on	the  file.   If the standard stream stdout refers to a terminal it is line buffered.  The standard stream stderr is always
       unbuffered.

       Setbuf is used after a stream has been opened but before it is read or written.	The character array buf is used instead  of  an  automati-
       cally allocated buffer.	If buf is the constant pointer NULL, input/output will be completely unbuffered.  A manifest constant BUFSIZ tells
       how big an array is needed:

	      char buf[BUFSIZ];

       Setvbuf, an alternate form of setbuf, is used after a stream has been opened but before it is read or written.  It has three uses,  depend-
       ing on the value of the type argument:

       setvbuf(stream, buf, _IOFBF, size)
	    Causes  input/output  to be fully buffered using the character array buf whose size is determined by the size argument.  If buf is the
	    constant pointer NULL, then an automatically allocated buffer will be used.

       setvbuf(stream, buf, _IOLBF, size)
	    Like above, except that output will be line buffered, i.e. the buffer will be flushed when a newline is written, the buffer  is  full,
	    or input is requested.

       setvbuf(stream, buf, _IONBF, size)
	    Causes input/output to be completely unbuffered.  Buf and size are ignored.

       A  file	can  be  changed  between unbuffered, line buffered, or block buffered by using freopen (see fopen(3)) followed by the appropriate
       setvbuf call.

SEE ALSO

       fopen(3), getc(3), putc(3), malloc(3), fclose(3), puts(3), printf(3), fread(3).

4th Berkeley Distribution					   May 12, 1986 							 SETBUF(3)